Acoustic Holography of the Solar Convection Zone with GONG Data

Braun，Douglas《太阳对流区声学全息术与GONG数据》AST-9987286在这项研究中，地震全息术的原理被用来发展一种描述和成像太阳活动区声学特性的方法。利用全球振荡网络小组收集的观测数据，将对太阳进行广泛的地震调查，以便编目太阳黑子、斑块、大型活动区复合体和气孔的相衬图像。在此基础上，将设计出一个所谓的“声学护城河”的一般模型，以确定它们的热和对流特性，以及这些现象在太阳黑子内部和周围的热量传输中所起的作用。利用长波振荡模式，该方法将进一步应用于太阳内部的深度成像。将这项技术扩展到对太阳远端表面进行成像，可能会为一个重要的新的“空间天气”预警系统提供基础。大规模的太阳爆发或耀斑可能会对地球上的航天器、通信系统和电网造成严重破坏。太阳的远侧图像可能会提前一周或更长时间识别出潜在的危险条件。该项目的资金由美国国家科学基金会恒星天文与天体物理学计划(AST/SAA)提供。

ABSTRACTBraun, Douglas"Acoustic Holography of the Solar Convection Zone with GONG Data"AST-9987286In this research the principles of seismic holography are being used to develop a method of characterizing and imaging the acoustic properties of solar active regions. Using observations collected by the Global Oscillations Network Group (GONG) a broad seismic survey of the Sun will be conducted in order to catalog phase-contrast images of sunspots, plages, large active region complexes and pores. From this a general model of so-called 'acoustic moats' will be devised in order to determine their thermal and convective properties, and the role such phenomena play in the transport of heat in and around sunspots. Using the long-wavelength modes of oscillation, the method will be further applied to deep imaging of the solar interior. Extension of this technique to imaging the solar farside surface may provide the basis for an important new 'space weather' early warning system. Large solar outbursts, or flares, may cause serious damage to spacecraft, communications systems and electric power grids on Earth. Far side images of the Sun may identify potentially dangerous conditions a week or more in advance.Funding for this project was provided by the NSF program for Stellar Astronomy & Astrophysics (AST/SAA).